I had been using WhatsApp on my primary phone, which is a Passport running OS 10, and was unable to migrate the conversations to a different phone before WA support stopped and the conversations became inaccessible. There are two or three conversations that are extremely important for various reasons and must be accessed. Is there any way at all to do this? I would really appreciate some help here! Thanks in advance!

Could not try it, unfortunately, because my notebook (Win 10) for some reason can't see the phone, though there's a ting sound when I hook it up through the USB cable. But it used to earlier! I have to address that problem first, or find another computer to do this (WhatsApp recovery). Will let you know either way.